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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b2c541d8549e04b34db70953378ad2a0ad5aacbd589c392874b577a48e5ed3' 
  AND token = 'hDHIW78v90WHQBt8SZUK/+WXZgCEVGNtHOdMFgtxwug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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