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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd21d52c75401ac64c3f1938cce8f84973047ae8a8a2135654ec870069bf18b' 
  AND token = 'j+R4vFcrb7Obg0lM7Y1hK+BtNni+nkdyzGLHrNsenVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}