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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e514eed89aca5e54dfaf22064663eb5b9dacc3b98eafe44f1aeec9201350c7' 
  AND token = '1FqtpYaUIHaSF59jbyUtgPWdaUV7cPpOFTuMyuqu/Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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