SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87baafd6fb055dbeb1274dc6a385262bdd52f62326574d2836f4025ad7250511' 
  AND token = 'oBUhUlrgv5LGamoIOQVi+x/w1HuZxCqZWcBW4eZcV4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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