SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7f2340fb79f19f1baf737b5395b841e12c45881b43c2f36d09b2620fb7be04' 
  AND token = 'nIDFOhT+tqv3Ou+qMlL7nBcfJHXByG7K7U7VjEjxGgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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