SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf8587cd590b747d8a3c6643d5ad86e74cec86c9b057206351c17090fb6bfb3' 
  AND token = 'xB25aahi+yEgqEOe/55077JnXH2dOZU94F3jTvzMYf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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