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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f935be6f5baeea4694ddc7bd007a67cd75d77b8fe8464db957432b7b2c5b7207' 
  AND token = 'H55R7ViXLnP8Pj4+9A/QX4UYf2RyjkHxBLACEtFX1qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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