SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda35a61830298af0db613529f3346b4f3965996b1b7126a9beb8b6b460e4786' 
  AND token = 'mqIF0qvhNB0/HxErOoXGGkiI6gYDVV6ySj5GW5Ad++M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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