SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c9f492f9a453bdf000737e53798a74d3baf978b866f287ba27bc7fad6f722b' 
  AND token = 'nXgYM7/SVKhzKZvKXYvgKBPkGoSn6E80UU/JnqJE4LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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