SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d86f6bbebcbebb49e42f3c7590b70d229a6a0b19561a6f3835ca438406c41dd' 
  AND token = 'j1JIp+/GSvVjb5WouMGmoEJD1RGHV5GD5lTowhjKwrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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