SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0637f93f03eb14c278a921c9d8a4968f07862e81644b64fcc75fba72e07dfa92' 
  AND token = 'bpSOw1fW/hfkqhVc0NClhAZP/W9dhCTCiKebYgOj2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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