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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99db62c34a838633e700a3b4b14da9251697caf2a6995199ae7102d688c5ee14' 
  AND token = 'et51Nj01055NS0YBL6f0+c2H+7flIbAZhfjiF/Zxpk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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