SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01b4707ef3305e3c4a9e476a759d94c202341303dfc74a497f3cc5fa032e64c' 
  AND token = 'rjugziAjMkquZXYoxKpb6sCvIJg+KXepr+8iP8wb9yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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