SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cfe7b05275103d36a46060251ab451bc839fcccb46d976c7c16db0c44e3672' 
  AND token = '+WD/3XBYHnPmJfhCzxb+ZKhm1HgVS6RA/G0moMMO4B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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