SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2128d75c9c47a0ba324e82188fa17eb4226d8b9b610529713b53bd280c270cd9' 
  AND token = 'rGIWEwqHzjOoWmQ0VN/3kjrCJiTZrGQHw94u/qshjxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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