SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43989067ed57fa47dca3ff7627c38610af1d33b862b3911baae4942c563e5104' 
  AND token = 'hOH/D7/GQaaGkQPVUccWL8GXMN+4HNYWguLJ1Y4GnR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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