SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b26a130a373cac5290167c60850e4076c2f995969b5ea691ab72a68b4699db' 
  AND token = 'Q7agrsXmvCgiv3EBsGnY/GZh+/YXak4gLwFv4JN21AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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