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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee77c2190fb12bc7ae1cac306437b6a63a70c1e741e7f902c40e8d5d3b41d577' 
  AND token = 'M34fj7RAKbK3C4os+pxWAQRZDezA8cygy6DSF61pYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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