SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd288190462b4be408946d6682af10c2d032948af1e87cccdc58272785f963e5' 
  AND token = 'aw4MGOZqZv0FJ6tQ9I6hBi/gKxYhTMGDBAw6Af8BTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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