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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b0a8748d19b7c609858b5f8989dbd10eb5f1539ab8e61548b52eca136169c4' 
  AND token = 'PM4l7EpoW/pJryNpX51xhGLH90ejNVP7QtmuuxxYbDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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