Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff75349f745f0a245abce51d4c483f08037d9a651cc52ace3760a8d9d5265359' 
  AND token = 'kBytQkLmpgAZUg0a3jqWkofjOqfERfhwLGNCMyhDv7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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