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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3ba4a7787ced036683a7288bd77dc23957d2148efeeaa198547e60766c874f' 
  AND token = 'oWSdycWZQvKUO5zhEUMYWDK+KewG1Wn3xI4IIbOtIhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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