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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7488c93014618a8d0f79e047691f4ad0ee74bf14d741b253802a4f74497fdf' 
  AND token = 'qUCsOhfsFhRCCzd241sAHEnVLriUkClkr6oMeLmlkl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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