SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3de3711c6e55f9918cf1842cba92c50773435c3286f54370c33730d672fa73' 
  AND token = 'GAfmsdaBh1XE0+UkUSV0Awp7k8jhg/lqTo3+KxnjGmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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