SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac402719dde8cd6871b029d7bd6f3807658c7cbe1c65279913ce8b4fe264dc2' 
  AND token = '7L8P5TUNDvj1rx1zvqpAY//MopBBlm6oRXhzK6SGQrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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