Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00878943bd81694bd30ad9d01b93c3ad7d678244a6035c6c1a69b12c6fab98ac' 
  AND token = 'jQVACm3nCIblTaUHRx0vj57AaxGryFatrHm+8HVJFg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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