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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d03091d0f56b18e06190df33121a9c3c10369f20f20630d0b9de8a55341dcd4' 
  AND token = 'gODlsUH+P5KRrC+4I7EayHMitdEyMMWj/OhYfacWIs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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