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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dcb5cad46920970a01d811e81df0ae99c13e41b51b9330f9ddb073e08870f1' 
  AND token = 'hai5s8eXd8XoUnwW5xZqioIvvIkJXiUvnut4KaftRKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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