SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfd884eff362e4fd6d2b673138ff209c2744826dc3fe511aae60231c4dbd16f' 
  AND token = 'vwki7hOhB/aA99pY7iiFLHPaMg/j/hjMWNO6ZAwmKqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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