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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b49d076baf8d7f403bacfc0c20ea48574a3d71e455ddd86eee82071cf58032d' 
  AND token = 'K/ThaojE4DVi7wAuzrQ5flwSm3gRDVVc1jlBPoXacg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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