SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22adbe42572367721d398f28669bc5e47fe226df8c791a39fa505a775d41017' 
  AND token = 'vroIjUKWy0HxZ9OVJAtMULWXAUYRMOqrieaxPzVg67M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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