Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8f13ce5e0709aeb4089d374697d802bc5079c200fbf89aaa0662b267ed8a7d' 
  AND token = 'fIUTbyFgcKJjyNBhqceOT3QmDvH15C81+iR309dCXak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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