Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de135f9e9e7875416b6112228c4945a6e8ad352a330ecd89eae0f06443808b88' 
  AND token = 'OEXJwPcUk3+/ASuTxJ3RhZhiY/7SFe0PnGGRfkukjHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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