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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3a613b6ae8a59a73ecff5d37bf9d1655673579c2574a089945358ab31b52fe' 
  AND token = 'yPKq4KliuuSLxxQViuWaA4q5iYk9/ehCYHSdVu1Hi2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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