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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ab0771fbdae418e0eb3558e34ba6ecd8e168fd96cc56b34f373a7827e7ef5c' 
  AND token = 'UgChD92NDI/h/BcypWN0M46mHM4apcwOlNg0QN84FMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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