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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd823035b8420de802a75c55da9e0a4daa07b72116e87dc38c97fd76f978e859' 
  AND token = 'iyVZEj1/snD2/aUqD1dO9Txkeihyj80w00f4UiLjRdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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