SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e5cd728f8ddf44c8c75e4b86fb5060529b4f05b19c125d9a37d300716701b7' 
  AND token = 'zGXgACyqv6fS6bZJL7V3zJ26oi8JG4g+q11X4+Uzj7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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