SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80132e9928c2fe81cb0a6a558e7b48fee2480749656cf0066489c1a04b9b25c' 
  AND token = 'HYfSMhzKC8iMJ9S5tH+JXRGQg3ItB3CSQovlGeBGq1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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