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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6632d5ab3fdf41dff0d07118f2ddbb4c65edd61d91931af96412f65d2d1604' 
  AND token = 'bCOQ0BHhE6b9ojTPvdzie0lI7rTfQkrIRzTmUzPLSKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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