SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64016aac3dde5b231d9a74c17b287c29bc4f2e370e61bf1bcd4b3e446f49d298' 
  AND token = 'dGBgi0FvKU1iO2nfrRs5LpCYzmt/RXgp//MAMFVPSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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