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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1823c84c119275bd99741a95d9f62f2c5658a047f60d5f11cffa18426bf4371' 
  AND token = 'eBYc2MFKPWqQr5utypjg1aPX3Mbd7fY19KvGXUllpkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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