SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8a9ce705c04babe812be29a352e86967d7b459dceb16b420293935423b0759' 
  AND token = 'QJ8vn35jv+1WS/0ri5Yyum6BlM2PR4/nPBUqwmJCoKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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