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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b919c8bf0907ea78230a7719bb887bdb0d76437555a5d447258bda2a69a83fe' 
  AND token = 'lLYllBnlFeKFmCyfq8lQ0LIxRJ8w4V7ZpZxmTtgZXO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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