SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59208b7f1c7bf7a4620ab0187fd9aaecb202313667071fc43ca123818542156' 
  AND token = 'z3ab5OL5uDu8J5eMGeVwQVFHSu+JZLj4CBC7ubU/Fs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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