SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd525068452df88ad08e01ce9fb3f445fb0fc5c9c3de491e7b42d421614ebc70c' 
  AND token = 'jIvwoWJ6oRZe8/mDnTuUx8nYdRe/yVjhu7KqzGro4nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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