SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a672f00920158f56d4691e32eb8ce7ab7bc9be87db1df42812483cd94cf0c4' 
  AND token = 'QPOqugbQ16l3hFgVIIVWcimZ20/QoMTzG8COzXkKYMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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