SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc462c3062af447b6228514c166f1866fc4670937b7a5dfc4e055e7c2d3e4f5b' 
  AND token = 'stzFbGbfCzprjJMhYpKlS93TIgcKLkyWBYY9U6LDEOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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