SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a128807c97e8899c359e3112b02b48bdb8db96ef4311f9bc18f23aea8e3a4c' 
  AND token = 'Z25L5YoLBjHbgHY9OpTYEmx/UZGM36aNFVhOzJSt0+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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