SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f9c2a74c6cca69c01cb8bb15c255aa0640815f9547b22a14e614a28d33aa63' 
  AND token = 'q7znqXmq+N2m6DulzTfpXgbXaX2lwJ+iZQbGtVhj28o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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