SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371f608c553f05080348f0261bb2b44da6ca4783405eabb36c548661cf426366' 
  AND token = 'quKGfbH4DW/U0jRThZCqBBQEazJw80q4Bug5vJ7+l2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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