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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98209e94a542e24f491e28f0ac988d47b1acc9bacd03235084722e866924ab65' 
  AND token = '8jAok/+ScsUaY7riuovvrwqIC2h2poXIevxvKFcI+X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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