SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433d6d627df3374b0aeb4c0ae791c459a7e87af4cb4b1f915d86818e486536d6' 
  AND token = '/YucQFh3ZOWIuRrxuCGFV68qAFNIQXTnG+54ZQ9SPBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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