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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad1510faace8ef62b2c9b6df2a62ee12d9d25d73778fb591903b91182fe43ea' 
  AND token = '8tzceI5BXzOrZt3wyrU6N5CpLxc1x0HJVxtimQQtwJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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