SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dd81d55e4ddb60d65b87e660690809d37232904ea3ea9e0fbac5cb85c040fa' 
  AND token = 'GLPYPH5WYsouZum+zqshdJDEEDbqBGuwzHyVRV3YT9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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