SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec07d754615c08cf5c1d7c45d40bc98a47ae26dcde172c58635a2d9784f9b2d' 
  AND token = 'SY9D+LJRYjp0AwviYn7f0+ZGf9AoCL8tHKEQVV428zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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