SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d98094fb53224c6bf25eb49ed97bc3659adf3727344f666c5b1dff49f75f3a' 
  AND token = 'YLpzvExeb1xjrCp5jgfCQNGl/grCJGemBl8wcrQnYWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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